CDC
https://www.cdc.gov/coronavirus/2019-ncov/community/schools-childcare/schools.html
EPA
https://www.epa.gov/indoor-air-quality-iaq/improving-indoor-air-quality
https://www.epa.gov/indoor-air-quality-iaq/introduction-indoor-air-quality#health
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ASHRAE
https://www.ashrae.org/file%20library/about/position%20documents/pd_infectiousaerosols_2020.pdf
https://www.ashrae.org/technical-resources/filtration-disinfection
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OSHA
https://www.osha.gov/Publications/3430indoor-air-quality-sm.pdf
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Homeland Security
https://www.dhs.gov/science-and-technology/sars-airborne-calculator
DOH Westchester County
https://health.westchestergov.com/legionella-cooling-tower-regs
Needlepoint bi-polar ionization
https://globalplasmasolutions.com
UV Lights
https://www.energyvanguard.com/blog/do-uv-lamps-really-improve-indoor-air-quality